Long, stainless steel rod can be inserted to 24", allowing you to test compaction levels as far down as subsoiling depths. As you insert rod, compaction needle rotates within liquid-filled stainless steel housing, indicating compaction levels in psi (in three ranges: 0-200 psi, 200-300 psi and 300+ psi) along a color-coded dial. Incremental 3" depth markings along shaft help you monitor and record changes in compaction levels at different depths. Features two interchangeable stainless steel tips (3/4", 1/2"), and rugged, molded plastic housing/handle.